Philips QL Induction Lighting Systems - Philips Lighting

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4. Lamp operation 4.1 Starting characteristics 4.1.1 Ignition and lifetime performance QL lamp systems offer direct, flicker-free ignition after switch-on, in both cold and hot conditions. Ignition time: < 0.5 s Hot-restrike time: < 0.5 s Minimum HF generator test-point temperature for ignition: -25°C/-13°F. 4.1.2 Luminous flux during starting period The run-up behavior of QL lamp systems is influenced by: - Luminaire construction. - Ambient temperature at the moment of ignition. - The duration of the period that the system was cooldowned after the last switch-off. The QL lamp systems are based on the low-pressure mercury discharge technology and therefore in principle sensitive to (changes in) ambient temperatures. This means that after switch-on the light output of the lamp will vary until a stable situation is reached, which depends on the actual operating conditions. This will not happen in seconds but in minutes. If a lamp has reached the stable level and is switched on again after a short off period, light output will immediately return to around the normal stable level (incandescent lamplike). 4.1.3 Lumen maintenance The luminous flux of a QL lamp system is expected to have depreciated after 60,000 hrs to no less than 75% of the initial flux (see figure 20 for a lumen maintenance curve). Light (%) QL 85W/840 maintenance 110 105 100 95 90 85 80 75 70 0 10000 20000 30000 40000 50000 60000 Life (h) Figure 20: Lumen maintenance curve 4.2 Burning position Although the burning position is universal, the relation between light output and temperature will be different for different burning positions. In the base-up position of the QL lamp system, the amalgam temperature will be slightly higher than in the base-down position with the same environmental conditions. This phenomenon can be used in luminaire design for specific ambient temperatures. As an example, the shift of the luminous flux curve for a typical design is given in figure 21. Figure 21: Typical influence of burning position on luminous flux 4.3 Optical design QL lamp systems offer a homogeneous light distribution, and can be used in a variety of luminaire designs. The choice of material, shape and dimensions can help ensure optimum functioning of the lamp (mechanically, thermally and photometrically). If a lot of light is reflected back to the lamp, this will increase the lamp operating temperature and may result in lower light output. The reason for this is that the main amalgam temperature will increase, which in turn regulates the light output. For the same reason, it is advised to keep the lamp cap behind the reflector (if used), because the main amalgam is located in the lamp cap (see figure 22). 14
Figure 22: Influence of reflector position around lamp with chimney effect A space between the reflector and the lamp ("chimney" effect) increases the main amalgam temperature. In some cases the main amalgam temperature can become too high, so that the lamp system’s operating point falls outside the preferred range. temperature range. In outdoor luminaires, which may be used at temperatures below 0°C/32°F, the luminous flux can be too low. This can be improved by increasing the temperature of the main amalgam. This can be done in different ways: - Position lamp base-up instead of base-down or horizontal if possible. - Improve insulation of the total luminaire; care should be taken in this case that the maximum permissible temperature of the HF generator and power coupler-mounting flange is not exceeded in the practical application. - Encapsulate the lamp base (partly) in a heatradiating envelope; this envelope can be a part of the power coupler heat sink or of the reflector. 5. QL lamp system specifications 5.1 Mechanical characteristics 4.3.1 Relationship of luminous flux, system wattage, amalgam and ambient temperature The QL lamp is provided with an amalgam. Therefore the light output and system wattage have a direct relationship to the amalgam temperature during operation. This means in practice that the actual luminous flux and system wattage depend on the luminaire construction, its heat insulation properties and the ambient temperature, which determine the actual amalgam temperature. For a typical QL lamp system the relationship between luminous flux and system wattage vs. temperature is shown in figure 23. See also the remarks about the amalgam temperature made in chapter 2.5.4. Figure 24: Power coupler dimensions Figure 23: Typical QL 85W lamp system curves for luminous flux / system power vs. temperature 4.4 Luminous flux vs. Tambient The temperature of the main amalgam normally controls the luminous flux of QL lamp systems. Therefore it will be more or less constant (deviation max. 15%) over a wide Power coupler type QL 55W QL 85W QL 165W A nom (mm / inch) 56 / 2.20 56 / 2.20 56 / 2.20 B nom (mm / inch) 40 / 1.58 40 / 1.58 40 / 1.58 C nom (mm / inch) 133.5 / 5.26 164.5 / 6.48 185 / 7.28 D nom (mm / inch) 27 / 1.06 27 / 1.06 27 / 1.06 E nom (mm / inch) 555 / 21.85 555 / 21.85 555 / 21.85 F max (mm / inch) 9.5 / 3.74 9.5 / 3.74 9.5 / 3.74 Table 10: Power coupler dimensions 15
Page 1 and 2: Photo courtesy of Seattle Public Li
Page 3 and 4: 1. General information on Philips Q
Page 5 and 6: The mounting flange should be mount
Page 7 and 8: 2. Luminaire design 2.1 Introductio
Page 9 and 10: consumption is 55W/85W/165W (see po
Page 11 and 12: Thermal radiation can also form a s
Page 13: 2. Testing the electrical strength
Page 17 and 18: 5.2 Electrical characteristics Ther
Page 19 and 20: 5.3.2 Luminous intensity diagrams A
Page 21 and 22: Average lumen gamma intensity (degr
Page 23 and 24: 6. Lighting installation and enviro
Page 25 and 26: 7. Service 7.1 General Although QL
Page 27 and 28: 8.7 Electrical characteristics Ther
Page 29 and 30: Luminaire measurement request form
Page 31 and 32: QL Induction Luminaire Design Check
Page 33 and 34: System is inoperative Check Action
Page 35 and 36: Low lamp light output Check Is ther
Page 37 and 38: Reference (A) Lamp base to power co
Page 39 and 40: Reference (D) Improper generator wi

Philips QL Induction Lighting Systems - Philips Lighting

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